Boiler-furnace



I.. G. SMITH.

BOILER FURNCE.

APPLICATION FILED FEB. 3. 1919.

Patented Sept. 7, 1920.

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n UNITED STATES PATENT OFFICE.

LINCOLN G. SMITH, OF DES MOINES, IOWA.

BOILER-FURNACE.

Specification of Letters Patent. Patented Sept. 7, 1920.

Application iled February 3, 1919. Serial No. 274,799.

To all whom t may concern Be itI known that I, LINCOLN G. SMITH, a' citizen of the United States, and a resident of Des Moines, in the county of Polk and State of Iowa, havel invented a certain new and useful Boiler-Furnace, of which the following is aspecificationl I Y The'object of my invention is to provide a boiler furnace of simple,`,durable and inexpensive construction. I More particularly it is my object to proi vide a boiler furnace having parts' so arranged as tosecure a maximum utilization of the heat.

Y A further object is to provide a'boiler furnace of the type in which the air for combustion .is directed through or over heated ashes andthe like for preheating beforev being delivered-to the products of combustion.

A further object is to provide sucha furnace having simple and effective means for feeding the furnace and for discharging the ashes and waste matter therefrom.

' With these and other objects in view my inventionconsists in the construction, arrangement and combination of the various parts of the device, whereby the ob] ects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and illustrated in the'accompanying drawings, in which.: Y Y

Figure 1 'shows a vertical, sectional view through a furnace embodying my invention; and 1 F ig. 2 shows a vertical, sectional view i taken on the line 212 of Figrl.

In the accompanying drawings I have used the reference numeral 10 to indicate generally the foundation or base of the furnace which' has the furnace wall or inclosure 11. f Y v Mounted at the upper part of the furnace inclosure is a boiler 12 having tubes 13 eX- tending through it. Y

Below the forward portion of the boiler is the combustion chamber 14, having' the grate l5, the supporting members 16and 17, and an upwardly and rearwardly inclined back wall 18. v v p rllhe supporting wall l17 of the combustion chamber is located rearwardly vof the front wall of the furnace inclosure as clearly illustratedin Fig. 1.v Y. Y

Communicating with the lowerl part of the boiler at the rear end thereof is a water conducting tube 19 extending rearwardly through the rear wall of the furnace inclosure, and Ythence downwardly and communicating with a large transverse pipe 20. Extending forwardly from the transverse pipe 2O is a series of pipes 21 placed below the 'boiler and extending entirely through thefurn'ace inclosure and communicating at their forward ends with another transverse pipe'22.

Extending upwardly from the pipe 22 is a pipe 23 communicating with the upper half of the boiler 12.

Communicating with the tubes 13 of the boiler at the forward end thereof is a stack 24. 'Located rearwardly of the furnace inclosure is a hopper 25 which communicates with a feeding tube 26 extending forwardly through the rear wall of the furnace inclosure and through the back wall 18 to positionffor discharging fuel to the upper rear part of the combustion chamber.

In the bottom of the hopper 25 and eX- tending'into the tube 26 is a spiral conveyer 27 used for feeding fuelvfrom the hopper through the tubey 26 to the combustion chamber. rEhe spiral conveyor is mounted on a shaft 28, on the outer end of which is a gearing device 29 by means of which rotation may be imparted to the conveyer.

One of the side walls of the furnace inclosure is provided with a clean-out and draft opening 30 below the grate 15.

At the lower part of the front wall of the furnace inclosure is an air supply and cleanout opening 3l for which a closure member 32 is provided.

Below the space formed between the walls 17 and the forward wall of the furnace inclosure is an adjustable grate or the like 33 below which is an ash pit 3a. Above the ash pit 34 is a hinged clean-out door 35, located in front of the furnace, as shown, but which may be locatedV wherever desired for convenience in cleaning out the ash pit.

The furnace inclosure wall at the side thereof is also provided withv a clean-out opening 36 rearwardly of the supporting wall 16. Y

Above the pipes 21 is a fire roof or partition 37 extending from the back of the furwhich will be hereinafter more fully explained.

In the practical use of my improved Vfurc roof BZiandf this is animportant feature of my invention. Y

When the tubes or flues 18` are cleaned the nace, the fuel is supplied to the grate through the pipe or tube 26 from the hopper by means of the spiral conveyer 27.V

As the fuel is Supplied, the ashes and' burned products are pushed forwardly off the grate into the lower part ofthe compartment formed between the wall 17 and lthe forward-wall of the furnace inclosure,rand such ashes and the like will drop on tothe grate 33.y f Y Air is admitted through the opening 31 and will pass through or over `the hot ashes Y and clinkers 39and be pre-heated before beingfurnished to the upwardly moving cur'- rent of heated gases and products of Acome i ,bustion, as such current passes upwardly,

asindicated by the arrow lO, around the ,front end of the fire roof 37. The heated gases pass thence rearwardly and into the rear ends of thc tubes 13 and thence through the boiler to the stack.

Air for the grateis supplied through the opening 30., f 'It willr be seen that air is furnishedto the burning fuel at the bottom of the combustion chamber, and that pre-,heated air --is supplied to the upwardly moving current Vof products of combustion at the proper points to effect complete combustion and make my deviceact as a smoke consumer,

It will be seen that thewater in the pipes 21 will be thoroughly heated.V so as to maintain a proper degree of circulation in the boiler. Y

NVater may be supplied `to the boiler through the pipe 22? and taken off in lfthe form-of steam in any ordinary way. My furnace is of very. simple and inexpensive construction, and yet aifordsfa com- Y plete control of the' fuel and 'ashes and sup- I plies the fresh air in such a Vway'as to secure maximum combustion.v v Y c Y Tater is heated in the tubes 21l and the yboiler is heated not only overits entire length below the boiler, but also fromtheV tubes inthe ordinary way, whereby the water in the boiler may be turnedinto steam with a minimum use of fuel with a maximum utilization of the heat from the fuel.

The chamber back of thejback wall 18 Yis i heated so that the coal is heated to a sub stantial degree before being dischargedrinto itlie combustion chamber. rEhe arrangement of'rfthe fire roof 37, vwhere it projects over I the combustion chamber forms a pocketfor f -ward part of said combustion chamber be- Y fore the coal is moved on tothe live coals above theigratel. This results in a more combustion in the coal.

The pipes 21 support and protect Vthe lire door 3SV may be opened and the soot and dirt dropped through the re roof 37 to the compartment below, from whence such soot and so forth may be removed throughthe door 36. .Y I Y c c ASome changes maybemade in the yconstruction andarrangement ofthe parts of my device without departing fromthe essentialV features and purposes thereof, and it is my intention to cover vby my Iclaims any modified forms of structureor use of mechanical equivalents which may be reasonably included within their scope.

l claim as my invention: ,v .is l 1. In aboiler:furnaceLa'furnaceinclosura a tubularv boiler Amember Vmounted in the upper portionthereof, a substantially horizontally disposed fire wall; extended across Y the inclosure in position spaced below the boiler member with its front edgeV spaced rearwardly from thelfront lwall of the inclosure, spaced transverse walls disposedsbelow said Vlire wall, a grate extended ybetween and supported on said transverse walls in Aposition spaced below the'fire wall, afclosure partition extended fromrthe rear grate supporting wall to said .fire wallsaid partition being spaced rearwardly from the front edge ofA thecfire wall-.thereby Vforming a pocket and means for forcing fuel through said partition out Yon tothe grate, whereby gas formed in the pocketbelowV the iire wall must escape around thegfrontf'edge offthe fire wall where it-rwill be exposed to the flames from the burning fuel onthefgrate. 2. Ina boiler furnace, a furnace inclosure, a boileredisposedthereinadjacent to the upper portionthereof, a substantially horizontallfire .wall extended `from the rear wall of the inclosure to position spaced rearwardly Vfrom the front `wall ofthe inclosure,said

fire wall being spaced ldownwardly from the edge -ofthejire wall, a partition `member extended upwardly from the rear end of said grate, whereby a gas'receiving pocket isformed below the forward portion of said fire wall, a second grate disposed'with- Y- in said furnace inclosure below and forwardly relative to thefirst described grate, Van air inletdisposed adjacent to Ythe second described gra'tein such position that thev air passing therethrough may be heated by the materialvon said gr ate,pand means for forcing fuel through. said vpartition on to saidf vfirst YVdescribed grate, whereby .gas formed in the gas pocket below the fire wall -from the heat 'of combustion will be Y v with the' flames from the burning fuel at substantially the same time that the gas from the gas chamber comes in contact there- 10 with.

Des Moines, Iowa, January 2l, 1919.

LINCOLN Gr. SMITH. 

